A wide varienty of things cause cancer: H.Pylorii, radium, smoking, benzene, chemotherapy even, soot.
This suggests that cells that are under constant attack react by turning into cancer, possibly after a long period, and as a last resort, as a kind of escape mechanism. Our cells evolved from prokaryotes, and then eukaryotes, and these cells adopted many protective mechanism to survive. Perhaps cancer is one of these protective mechanisms.
The cell says to itself "These guys are trying to kill me."
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